[issue8128] String interpolation with unicode subclass fails to call __str__

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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components: +Interpreter Core
nosy: +ezio.melotti
priority:  -> normal
stage:  -> test needed
type:  -> behavior
versions: +Python 2.7, Python 3.2 -Python 2.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8128>
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